A Unified Binary Neutron Star Merger Magnetar Model for the Chandra X-Ray Transients CDF-S XT1 and XT2
文献类型：期刊论文
| 作者 | Sun, Hui1; Li, Ye2; Zhang, Bin-Bin3,4; Zhang, Bing5; Bauer, Franz E.6,7,8,9; Xue, Yongquan10,11; Yuan, Weimin1,12 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-12-01 |
| 卷号 | 886期号:2页码:8 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab4bc7 |
| 英文摘要 | Two bright X-ray transients were reported from the Chandra Deep Field South (CDF-S) archival data, namely CDF-S XT1 and XT2. Whereas the nature of the former is not identified, the latter was suggested as an excellent candidate for a rapidly spinning magnetar born from a binary neutron star (BNS) merger. Here we propose a unified model to interpret both transients within the framework of the BNS merger magnetar model. According to our picture, CDF-S XT2 is observed from the "free zone" where the magnetar spindown powered X-ray emission escapes freely, whereas CDF-S XT1 originates from the "trapped zone" where the X-ray emission is initially blocked by the dynamical ejecta and becomes transparent after the ejecta is pushed to a distance where Thomson optical depth drops below unity. We fit the magnetar model to the light curves of both transients and derived consistent parameters for the two events, with magnetic field, initial spin period, and X-ray emission efficiency being (B-p = 10(16) G, P-i = 1.2 ms, eta = 0.001) and (B-p = 10(15.8) G, P-i = 4.4 ms, eta = 0.001) for XT1 and XT2, respectively. The "isotropic equivalent" ejecta mass of XT1 is M-ej similar to 10(-3) M-circle dot, while it is not constrained for XT2. Our results suggest that more extreme magnetar parameters are required to have XT1 detected from the trapped zone. The model parameters for both events are generally consistent with those derived from short gamma-ray burst (SGRB) X-ray plateau observations. The host-galaxy properties of both transients are also consistent with those of SGRBs. The event rate densities of both XT1 and XT2 are consistent with that of BNS mergers. |
| WOS关键词 | EMISSION ; NUCLEOSYNTHESIS ; BURSTS ; EJECTA ; FLARES |
| 资助项目 | Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB23040100] ; KIAA-CAS Fellowship ; Peking University and Chinese Academy of Sciences ; China Post-doctoral Science Foundation[2018M631242] ; National Thousand Young Talents program of China ; National Key Research and Development Program of China[2018YFA0404204] ; CONICYT-Chile Basal[AFB-170002] ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative[IC120009] ; NSFC[11890693] ; NSFC[11421303] ; NSFC[11833003] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000515070100007 |
| 资助机构 | Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; KIAA-CAS Fellowship ; Peking University and Chinese Academy of Sciences ; China Post-doctoral Science Foundation ; National Thousand Young Talents program of China ; National Key Research and Development Program of China ; CONICYT-Chile Basal ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; NSFC ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; KIAA-CAS Fellowship ; Peking University and Chinese Academy of Sciences ; China Post-doctoral Science Foundation ; National Thousand Young Talents program of China ; National Key Research and Development Program of China ; CONICYT-Chile Basal ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; NSFC ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; KIAA-CAS Fellowship ; Peking University and Chinese Academy of Sciences ; China Post-doctoral Science Foundation ; National Thousand Young Talents program of China ; National Key Research and Development Program of China ; CONICYT-Chile Basal ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; NSFC ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; KIAA-CAS Fellowship ; Peking University and Chinese Academy of Sciences ; China Post-doctoral Science Foundation ; National Thousand Young Talents program of China ; National Key Research and Development Program of China ; CONICYT-Chile Basal ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; NSFC |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28631]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Sun, Hui |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China 4.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing, Peoples R China 5.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA 6.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile 7.Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 22, Chile 8.Millennium Inst Astrophys MAS, Nuncio Monsenor Sotero Sanz 100, Santiago, Chile 9.Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA 10.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Hui,Li, Ye,Zhang, Bin-Bin,et al. A Unified Binary Neutron Star Merger Magnetar Model for the Chandra X-Ray Transients CDF-S XT1 and XT2[J]. ASTROPHYSICAL JOURNAL,2019,886(2):8. |
| APA | Sun, Hui.,Li, Ye.,Zhang, Bin-Bin.,Zhang, Bing.,Bauer, Franz E..,...&Yuan, Weimin.(2019).A Unified Binary Neutron Star Merger Magnetar Model for the Chandra X-Ray Transients CDF-S XT1 and XT2.ASTROPHYSICAL JOURNAL,886(2),8. |
| MLA | Sun, Hui,et al."A Unified Binary Neutron Star Merger Magnetar Model for the Chandra X-Ray Transients CDF-S XT1 and XT2".ASTROPHYSICAL JOURNAL 886.2(2019):8. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。